docs: refine

assets/__forwarding__clean.c

@@ -0,0 +1,35 @@
+int __forwarding__(void *frameStackPointer, int isStret) {
+    id receiver = *(id *)frameStackPointer;
+    SEL sel = *(SEL *)(frameStackPointer + 8);
+    const char *selName = sel_getName(sel);
+    Class receiverClass = object_getClass(receiver);
+
+    // 调用 forwardingTargetForSelector:
+    if (class_respondsToSelector(receiverClass, @selector(forwardingTargetForSelector:))) {
+        id forwardingTarget = [receiver forwardingTargetForSelector:sel];
+        if (forwardingTarget && forwardingTarget != receiver) {
+            return objc_msgSend(forwardingTarget, sel, ...);
+        }
+    }
+
+    // 调用 methodSignatureForSelector 获取方法签名后再调用 forwardInvocation
+    if (class_respondsToSelector(receiverClass, @selector(methodSignatureForSelector:))) {
+        NSMethodSignature *methodSignature = [receiver methodSignatureForSelector:sel];
+        if (methodSignature && class_respondsToSelector(receiverClass, @selector(forwardInvocation:))) {
+            NSInvocation *invocation = [NSInvocation _invocationWithMethodSignature:methodSignature frame:frameStackPointer];
+
+            [receiver forwardInvocation:invocation];
+
+            void *returnValue = NULL;
+            [invocation getReturnValue:&value];
+            return returnValue;
+        }
+    }
+
+    if (class_respondsToSelector(receiverClass,@selector(doesNotRecognizeSelector:))) {
+        [receiver doesNotRecognizeSelector:sel];
+    }
+
+    // The point of no return.
+    kill(getpid(), 9);
+}